1 files changed, 126 insertions, 0 deletions
diff --git a/crypto/hash-nettle.c b/crypto/hash-nettle.c
new file mode 100644
index 0000000000..8ec5572aff
--- /dev/null
+++ b/crypto/hash-nettle.c
@@ -0,0 +1,126 @@
+/*
+ * QEMU Crypto hash algorithms
+ *
+ * Copyright (c) 2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "crypto/hash.h"
+#include <nettle/md5.h>
+#include <nettle/sha.h>
+
+typedef void (*qcrypto_nettle_init)(void *ctx);
+typedef void (*qcrypto_nettle_write)(void *ctx,
+                                     unsigned int len,
+                                     const uint8_t *buf);
+typedef void (*qcrypto_nettle_result)(void *ctx,
+                                      unsigned int len,
+                                      uint8_t *buf);
+
+union qcrypto_hash_ctx {
+    struct md5_ctx md5;
+    struct sha1_ctx sha1;
+    struct sha256_ctx sha256;
+};
+
+struct qcrypto_hash_alg {
+    qcrypto_nettle_init init;
+    qcrypto_nettle_write write;
+    qcrypto_nettle_result result;
+    size_t len;
+} qcrypto_hash_alg_map[] = {
+    [QCRYPTO_HASH_ALG_MD5] = {
+        .init = (qcrypto_nettle_init)md5_init,
+        .write = (qcrypto_nettle_write)md5_update,
+        .result = (qcrypto_nettle_result)md5_digest,
+        .len = MD5_DIGEST_SIZE,
+    },
+    [QCRYPTO_HASH_ALG_SHA1] = {
+        .init = (qcrypto_nettle_init)sha1_init,
+        .write = (qcrypto_nettle_write)sha1_update,
+        .result = (qcrypto_nettle_result)sha1_digest,
+        .len = SHA1_DIGEST_SIZE,
+    },
+    [QCRYPTO_HASH_ALG_SHA256] = {
+        .init = (qcrypto_nettle_init)sha256_init,
+        .write = (qcrypto_nettle_write)sha256_update,
+        .result = (qcrypto_nettle_result)sha256_digest,
+        .len = SHA256_DIGEST_SIZE,
+    },
+};
+
+gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
+{
+    if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
+        qcrypto_hash_alg_map[alg].init != NULL) {
+        return true;
+    }
+    return false;
+}
+
+
+int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
+                        const struct iovec *iov,
+                        size_t niov,
+                        uint8_t **result,
+                        size_t *resultlen,
+                        Error **errp)
+{
+    int i;
+    union qcrypto_hash_ctx ctx;
+
+    if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
+        qcrypto_hash_alg_map[alg].init == NULL) {
+        error_setg(errp,
+                   "Unknown hash algorithm %d",
+                   alg);
+        return -1;
+    }
+
+    qcrypto_hash_alg_map[alg].init(&ctx);
+
+    for (i = 0; i < niov; i++) {
+        /* Some versions of nettle have functions
+         * declared with 'int' instead of 'size_t'
+         * so to be safe avoid writing more than
+         * UINT_MAX bytes at a time
+         */
+        size_t len = iov[i].iov_len;
+        uint8_t *base = iov[i].iov_base;
+        while (len) {
+            size_t shortlen = MIN(len, UINT_MAX);
+            qcrypto_hash_alg_map[alg].write(&ctx, len, base);
+            len -= shortlen;
+            base += len;
+        }
+    }
+
+    if (*resultlen == 0) {
+        *resultlen = qcrypto_hash_alg_map[alg].len;
+        *result = g_new0(uint8_t, *resultlen);
+    } else if (*resultlen != qcrypto_hash_alg_map[alg].len) {
+        error_setg(errp,
+                   "Result buffer size %zu is smaller than hash %zu",
+                   *resultlen, qcrypto_hash_alg_map[alg].len);
+        return -1;
+    }
+
+    qcrypto_hash_alg_map[alg].result(&ctx, *resultlen, *result);
+
+    return 0;
+}